JP3418567B2 - Clay layer propulsion method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method for a mud excavator and an apparatus therefor capable of efficiently excavating clay ground.

[0002]

2. Description of the Related Art The muddy water pressure propulsion method is to push muddy water from a muddy water treatment device installed on the ground around a shaft through a mud pipe to a muddy water digging machine at the tip, and fill and pressurize the muddy water from the face plate front end of the muddy water digging machine. And hold against the earth pressure and groundwater pressure on the front of the face plate and cut the ground by rotating the face plate,
This is a method of circulating the excavated soil together with mud through a mud pipe to a mud treatment device on the ground. This construction method is suitable for soft soils because the face is closed and the ground is stabilized by mud water, so that it is possible to prevent groundwater drop and subsidence due to the attraction of the ground. Moreover, since the excavated soil is a continuous fluid transportation system using muddy water, the construction speed is fast, the construction period is shortened, and the economy is excellent. Furthermore, in recent years, in order to deal with gravel layer ground, a cone crusher consisting of an outer cone and an inner cone has been installed in the mud digging machine, and the gravel was taken between the outer cone and the inner cone to crush and proceed. A muddy water excavator for gravel has been developed, which enables efficient propulsion construction even in gravel layers, and is widely used in a wide range of propulsion construction.

[0003]

With the development of the muddy water pressure propulsion method, continuous soil removal by the fluid transportation method can be performed even in long-distance propulsion construction, so that the ground can be cut continuously.
Enables efficient propulsion construction. When the propulsion extension becomes long distance, the soil quality changes within the propulsion extension too, and it is necessary to consider a mud excavator suitable for the soil quality. When the soil changes into a sand layer and a clay layer, measures are taken by adjusting the aperture ratio of the mud excavator face plate and the concentration of muddy water. Clay adheres to the inner surface of the chamber, making it impossible to cut or causing blockage in the chamber. When the soil quality changes to a gravel layer and a clay layer, a normal mud excavator or a mud excavator for gravel is selected in consideration of the gravel diameter. The cause is that the gravel of the ground is taken in in its original form, so the gravel is stored and clogged in the chamber, or it is blocked at various places in the sludge pipe,
This is because the fluid cannot be transported. When large gravel is mixed, the face plate of a normal mud excavator has a small opening ratio of the intake port and cannot be taken into the chamber, and the gravel is left in the state where large gravel remains on the front face plate. This is because the face plate resistance gradually increases, and in some cases, it becomes impossible to proceed with excavation. In a mud digging machine for gravel in a clay layer, clay adheres to the walls of the outer and inner cones that are especially equipped to crush gravel, causing frequent blockage at the bottom of the inner cone, resulting in a significant propulsion speed. It may decrease or become impossible to propel.

The present invention proposes a propulsion method capable of preventing clogging of a face plate of a mud digging machine or a chamber in a muddy water propulsion work in a clay layer, thereby enabling efficient propulsion work.

[0005]

[Means for Solving the Problems] That is, according to the present invention, a mud water treatment device installed around a shaft is connected to an excavator through a shaft through a shaft for sending and discharging mud, and the mud sent from the mud pipe is used for grounding. In the method of propulsion of the mud excavator, in which the excavated soil excavated at the tip of the excavator is returned together with the mud from the mud discharge pipe to the mud treatment device while holding the mountain, the inside of the adjustment tank of the mud treatment device installed around the shaft is A charging device for charging coarse particles is installed at the outlet, and the coarse particles and muddy water are jetted from the outlet of the adjusting tank through the mud pump by the mud pump at the tip of the mud digging machine and cut. This is a method for propelling a clay layer, which comprises scraping off clay adhering to a face plate or a chamber, and circulating the clay together with a rough flow material and mud through the mud discharge pipe to a mud treatment device. In addition, a hopper that can store a predetermined amount of rough flow material in the upper part, and a connection pipe that connects the lower part of the hopper through the adjustment tank of the muddy water treatment device to the suction port to the mud pump It is a device.

As the muddy water treatment device, a device comprising a conventionally used muddy water treatment device, an under tank, a surplus muddy water tank, an adjusting tank, etc. is used, and the muddy water is stored to adjust the muddy water to the mud digging machine. A connection pipe equipped with a hopper capable of storing a predetermined amount of coarse particles is inserted in the upper part of the outlet connecting the tank and the suction port of the mud pump. A valve or the like may be provided between the hopper and the connecting pipe so that a predetermined amount of coarse grain material can be charged or stopped.

The sending and discharging mud pipes that are piped from the mud treatment device to the mud digging machine may be the same as in the prior art. Inside the propulsion pipes, pipes are arranged in parallel downward so as not to hinder work such as surveying. It

[0008] The sending / discharging mud pipe connected to the mud digging machine side is connected to the partition wall in a normal mud digging machine, but only the mud sending pipe is extended to the middle of the chamber to form coarse particles. It is also possible to take measures to make it easier for the material to be ejected to the front surface of the face plate. In addition, in the case of a gravel mud excavator, a mud pipe is connected to the outer cone in the chamber, and muddy water and coarse particles are jetted forward from the injection port of the swash plate provided at a predetermined position of the outer cone. It By providing the injection position of muddy water or coarse particles in the upper part, muddy water or coarse particles can be uniformly dispersed from the upper part to the lower part.

The coarse-grained material sprayed from the mud-sending pipe in the chamber by the mud-sending pump is distributed on the front surface of the face plate and inside the chamber, and is swirled by the turning of the face plate and the circulation of the mud water, as well as the inner surface of the face plate and the chamber. Scrape off the adhered clay,
Prevents blockage in the face plate and chamber, enabling efficient ground cutting and continuous soil removal of excavated soil.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view for explaining a method for propelling a clay layer according to the present invention. In the ground above the start shaft 23,
A muddy water treatment device 1 is installed. The muddy water treatment device 1
It is a device for separating the muddy water and the muddy water discharged on the ground by excavating with the gravel and mud excavator 12 and repeatedly using the muddy water as the muddy water again. It is determined by the constraints of. The main equipment is a muddy water treatment machine 2 that separates gravel and muddy water.
And the adjustment tank 3 for adjusting and storing the specific gravity of the mud water to be sent, and the surplus mud tank 4 for treating the excess mud of the adjustment tank 3 and the like. The suction port of the mud feed pump 10 is connected to the take-out port 5 of the adjustment tank 3 via a valve, and the discharge port is connected to the mud feed pipe 11. The adjusting tank 5 is provided with a connecting pipe 8 vertically along the wall surface, one end of which is inserted into the outlet 5 in the adjusting tank 5 and the other end of which is capable of storing a predetermined amount of coarse-grained material 21. A charging device 6 connected to is installed. A valve 8 for adjusting the input amount of the coarse-grained material 21 and for stopping it is provided at the connecting portion between the hopper 7 and the connecting pipe 8.

The mud pipe 11 passes through a shaft bypass 22 in a starting shaft 23, a propulsion pipe 24, and a gravel mud excavator 12.
Is connected to the partition 19. The gravel mud digging machine 12 is equipped with a face plate 15 having a large opening ratio at the tip, and an outer cone 1 for crushing gravel is provided in a chamber 20 behind the face plate 15.
7 and inner cone 16 are equipped. A space is formed in the outer cone 17 by the outer shell of the gravel and mud water excavator 12 and the swash plate, and the mud water pumped to the partition wall 19 can pass therethrough. The swash plate on the upper part of the outer cone 17 is provided with an injection port 18 for injecting the muddy water and the coarse particles 21 filled in the outer cone 17 forward.

The excavated soil, the muddy water and the coarse particles 21 taken into the chamber 20 are sucked by the sludge pump 14 installed in the starting shaft 23, and the vertical shaft bypass 22 from the sludge pipe 13 connected to the partition wall 19. Through the muddy water treatment equipment 1
Is recirculated to. Circulating excavation and muddy water and coarse particles 21
Is separated into coarse particles 21 and muddy water by the muddy water treatment device 2. The separated coarse grain material 21 can be returned to the hopper 7 and reused.

In the present embodiment, the method of installing the charging device 6 in the adjusting tank 3 has been disclosed. However, the charging device 6 is connected in the middle of the mud feeding pipe 11 and pressure fed into the mud feeding pipe 11 by a pump or the like. It is also possible to use the method.

Although the gravel mud digging machine 12 is shown as an example of the mud digging machine, an ordinary mud digging machine may be used in the case of a sand layer and a clay layer. In this case, chamber 2 of the mud drill machine
Since the outer cone 17 and the inner cone 16 are not provided in 0, a method is adopted in which the mud pipe 11 is extended forward of the partition wall so that the coarse-grained material 21 is easily exposed on the front surface of the face plate 15.

Aggregate such as gravel or crushed stone is used as the coarse-grained material 21, and the diameter is such that it does not cause blockage in the chamber 20 or the mud pipes 11 and 13. Also, coarse grain material 2
It is necessary to change the blending amount for adding 1 depending on the nature of the clay.

Next, the propelling method in the clay layer will be described. The mud water adjusted in the adjusting tank 3 is sucked from the take-out port 5 by the mud feed pump 10 and sent to the mud feed pipe 11 from the discharge port. At this time, the coarse-grained material 21 is introduced into the outlet 5 from the hopper 7 through the connecting pipe 8, and the coarse-grained material 21 is sent to the mud-sending pipe 11 together with the muddy water. Muddy water and coarse grain material 21
Is injected into the outer cone 17 from the inside of the propulsion pipe 24 through the partition 19 of the gravel mud excavator 12 through the shaft bypass 22 in the starting shaft 23, and the injection port provided on the swash plate above the outer cone 17. It is injected from 18 to the inside of the chamber 20. The coarse-grained material 21 sprayed on the front surface of the face plate 15 or in the chamber 20 flows due to the swirling of the face plate 15 and the circulation of muddy water, and scrapes off the clay adhering to the face plate 15 and the chamber 20. The clay and the coarse-grained material 21 scraped off are
3 is sucked in, is passed through the vertical shaft bypass 23, and is recirculated to the muddy water treatment device 1 on the ground, and is separated into coarse-grained material and muddy water.

[0017]

As described above, according to the method and apparatus for promoting the clay layer of the present invention, the coarse-grained material pumped together with the muddy water removes the clay adhering to the face plate and the inner wall surface of the chamber of the muddy water excavator while flowing. Since it is surely scraped off and discharged along with the muddy water to the mud discharge pipe, there is no blockage in the face plate or chamber as in the past, and efficient propulsion construction is possible.
In particular, in the case of gravel and muddy water propulsion construction, the coarse grained material is conveyed while writing down the clay adhering to the surface of the outer and inner cones, eliminating the frequent cone blockage and significantly improving the propulsion speed. did.

[0018]

[Brief description of drawings]

FIG. 1 is an overall view illustrating a method for propelling a clay layer according to the present invention.

[Explanation of symbols]

1 Muddy water treatment equipment 2 Muddy water treatment machine 3 adjustment tanks 4 surplus mud tank 5 Exit 6 Input device 7 hopper 8 connecting pipe 9 valves 10 mud pump 11 mud pipe 12 Muddy water machine 13 Drainage pipe 14 Vertical shaft bypass 15 face plate 16 Inner cone 17 Outer Cone 18 jets 19 partitions 20 chambers 21 Coarse grain material 22 Vertical shaft bypass 23 Starting shaft 24 Propulsion tube

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP 54-161730 (JP, A) JP 3-100300 (JP, A) JP 6-346688 (JP, A) Actually published 55- 71793 (JP, U) Actual development Sho 57-75094 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/12

Claims (2)

(57) [Claims] 1. A drilling machine tip is connected from a mud treatment device installed in the vicinity of a shaft to a drilling machine through a shaft through the propulsion pipe and holding the ground by the mud sent from the pipe. In the method of propelling the clay layer of the mud digging machine, which recirculates the excavated soil excavated in 1. with mud water from the mud discharge pipe to the mud treatment device, the coarse-grained material is used at the outlet in the adjustment tank of the mud treatment device installed around the shaft. A charging device is installed to feed the coarse particles and muddy water from the outlet of the adjusting tank through the mud pump through the mud pipe into the mud digging machine at the tip of the mud excavator. A method for propelling a clay layer, which comprises scraping off the clay adhering to the surface of the clay, and circulating the clay together with the rough flow material and mud through the mud pipe to the mud treatment device. 2. A hopper having an upper part capable of storing a predetermined amount of rough flow material, and a connecting pipe connecting a lower part of the hopper through an adjusting tank of a mud treatment device to a suction port to a mud pump. The charging device according to claim 1, which is provided.